HIGH-PRESSURE ELECTRICAL-RESISTIVITY OF YBCU2SI2

We report measurements of the electrical resistivity under hydrostatic pressure of the Kondo-lattice system YbCu2Si2 which manifests at low temperature the competition between Kondo and magnetic indirect RKKY i nteractions. With increasing pressure the Kondo temperature T-K decrea ses, magnetic ordering appears and the magnetic ordering temperature T -M rises. Thus, we show that this compound agrees with Doniach's phase diagram of Kondo systems. Copyright (C) 1996 Elsevier Science Ltd